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The new multistage water adsorption model of Longmaxi Formation shale considering the spatial configuration relationship between organic matter and clay minerals

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Petroleum Science 2022年第5期19卷 1950-1963页

作者： Zhi-Ye Gao Shu-Ling Xiong Lin Wei State Key Laboratory of Petroleum Resources and Prospecting China University of PetroleumBeijing102249China Unconventional Petroleum Research Institute China University of PetroleumBeijing102249China School of Energy Resources China University of GeosciencesBeijing100083China

The water adsorption by shale significantly affects shale gas content and its seepage capacity.However,the mechanism of water adsorption by shale is still unclear due to its strong heterogeneity and complicated pore structure.The relationship between the adsorbed water content at different relative humidities(RHs)and shale compositions,as well as shale pore structure and the spatial configuration relationship between organic matter(om)and clay minerals,was investigated to clarify the controlling factors and mechanisms of water adsorption by Longmaxi Formation shale from the Southern Sichuan Basin in China.Consequently,the water adsorption process could be generally divided into three different stages from 0%RH to 99%RH.Furthermore,the Johnston’s clay mine ral interlayer pore structure model(JCM),the Freundlich model(FM)and the Dubinin-Astakhov model(DAM)were tested to fit the three water adsorption stages from low RH to high RH,respectively.The fitting results of the JCM and FM at lower RHs were far from good,while the fitting results of DAM at higher RHs were acceptable.Accordingly,two revised models(LRHM and MRHM)considering the spatial configuration relationship between om and clay minerals were proposed for the two stages with lower RHs,and performed better fitting results indicating the pronounced effect of the spatial configuration relationship between om and clay minerals on the water adsorption process of Longmaxi Formation shale.The outcomes of this study will contribute to clarifying the water distribution characteristics in the pore network of shale samples with variable water contents.

关键词： Longmaxi formation shale Water content om-clay complexes Spatial occurrence relationship

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Methane Adsorption Capacity Reduction Process of Water-Bearing Shale Samples and Its Influencing Factors: One Example of Silurian Longmaxi Formation Shale from the Southern Sichuan Basin in China

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Journal of Earth Science 2021年第4期32卷 946-959页

作者： Zhiye Gao Shuling Xiong State Key Laboratory of Petroleum Resources and Prospecting China University of PetroleumBeijing 102249China Unconventional Petroleum Research Institute China University of PetroleumBeijing 102249China

Due to the existence of water content in shale reservoir,it is quite meaningful to clarify the effect of water content on the methane adsorption capacity(MAC)of shale.However,the role of spatial configuration relationship between organic matter(om)and clay minerals in the MAC reduction process is still unclear.The Silurian Longmaxi Formation shale samples from the Southern Sichuan Basin in China were prepared at five relative humidity(RH)conditions(0%,16%,41%,76%,99%)and the methane adsorption experiments were conducted on these water-bearing shale samples to clarify the MAC reduction process considering the spatial configuration relationship between clay minerals and om and establish the empirical model to fit the stages.Total organic carbon(TOC)content and mineral compositions were analyzed and the pore structures of these shale samples were characterized by field-emission scanning electron microscopy(FE-SEM),N2 adsorption and high-pressure mercury intrusion porosimetry(HPMIP).The results showed that the MAC reduction of clay minerals in om occurred at different RH conditions from that of clay minerals outside om.Furthermore,the amount of MAC reduction of shale samples prepared at the same RH condition was negatively related with clay content,which indicated the protection role of clay minerals for the MAC of water-bearing shale samples.The MAC reduction process was generally divided into three stages for siliceous and clayey shale samples.And the MAC of om started to decline during stage(1)for calcareous shale sample mainly because water could enter om pores more smoothly through hydrophobic pathway provided by carbonate minerals than through hydrophilic clay mineral pores.Overall,this study will contribute to improving the evaluation method of shale gas reserve.

关键词： Longmaxi Formation shale water content om-clay complexes methane adsorption capacity reduction

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The methane adsorption capacity reduction process of water-bearing shale samples and its influencing factors: one example of Silurian Longmaxi Formation shale from the Southern Sichuan Basin in China

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Journal of Earth Science 2021年

作者： ZhiyeGao ShulingXiong StateKeyLaboratoryofPetroleumResourcesandProspecting，ChinaUniversityofPetroleum UnconventionalPetroleumResearchInstitute，ChinaUniversityofPetroleum

Due to the existence of water content in shale reservoir， it is quite meaningful to clarify the effect of water content on the methane adsorption capacity （MAC） of shale. However， the role of spatial configuration relationship between organic matter （om） and clay minerals in the MAC reduction process is still unclear. The Silurian Longmaxi Formation shale samples from the Southern Sichuan Basin in China were prepared at five relative humidity （RH） conditions （0%， 16%， 41%， 76%， 99%） and the methane adsorption experiments were conducted on these water-bearing shale samples to clarify the MAC reduction process considering the spatial configuration relationship between clay minerals and om and establish the empirical model to fit the stages. Total organic carbon （TOC） content and mineral compositions were analyzed and the pore structures of these shale samples were characterized by field-emission scanning electron microscopy （FE-SEM）， N;adsorption and high-pressure mercury intrusion porosimetry （HPMIP）. The results showed that the MAC reduction of clay minerals in om occurred at different RH conditions from that of clay minerals outside om. Furthermore， the amount of MAC reduction of shale samples prepared at the same RH condition was negatively related with clay content， which indicated the protection role of clay minerals for the MAC of water-bearing shale samples. The MAC reduction process was generally divided into three stages for siliceous and clayey shale samples. And the MAC of om started to decline during stage （1） for calcareous shale sample mainly because water could enter om pores more smoothly through hydrophobic pathway provided by carbonate minerals than through hydrophilic clay mineral pores. Overall， this study will contribute to improving the evaluation method of shale gas reserve.

关键词： Longmaxi Formation shale water content om-clay complexes methane adsorption capacity reduction

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